Upgrading to new system

@darcylynn no your remote will not work same as all of the other non SS3 components. Also, the deal, if still available, is only for your original configured system, not added on sensors. No swaps.

Call SS if you have any other questions.

Captain, what deal is for the "same system"?  I think the 100% deal is/was that way, but every other one I've seen, you can order anything you want all at whatever the discount is.  And (for the less than 100% deals), it appears you don't have to return "everything"; just the main parts (base, keypad, master remote)

IIRC, there were several posts around X-mas time that emails with offers for upgrading required the entire original system to be sent back.  This is where SS needs to be consistent, it seems to be different for nearly every user whenever they do these "offers".

I would like to know if the newest alarm system will integrate with Google Home? Do I need WiFi ?

I would like to know if the newest alarm system will integrate with Google Home? Do I need WiFi ?

You do not need wifi for the alarm system to function.

You DO need wifi for the system to receive firmware updates.

Also, you DO need wifi for Google Home I'm mostly pretty sure so to integrate the 2, yes you need wifi. :)

Are the sensors from the original system compatible with the new system. Entry, glassbreak, smoke, motion, siren.....

no, see my other response for the reason

Thank you for the Questions and Comments. I can explain how this '40% off Trade-in for All-New Upgrade' program works.
On the phone we put together an 'Upgrade System' order that matches one's previous model system device for device(like for like). Any extra items do Not get the 40% off but are normal full price. Cameras are the same model anyway so they don't need to be in it. [All devices (except cameras) are NOT INTER-COMPATIBLE; I can imagine the confusion there would be if they were.]
The order is purchased and in the same internal order page we make a return shipping label to be used to return the previous model system, After the new one is received of course. We send a link of the return label in an email (I make sure you have received it and can see the label itself) the link expires in a few days, yes print it asap. We can also remake the shipping label email and even a new return shipping label. For KeyChain remotes we do have "KeyFob"s for the new model system(they're convenient, but not essential like the old KeyChain).
BUT WHY Upgrade if the system works like it should? Unless the new model has a feature(s) you don't want to do without or some sensors stopped working completely(low batteries should be replaced) or anything you think is a significant enough difference for you.
I will explain some of the system differences in a separate comment.

Some of the main significant differences of the SS2 and SS3(New model system) models are...Looks, all devices(except smoke and CO detectors) look different; entry, motion, and glassbreak sensors are smaller, Base Station and keypads can be black or white.(smoke and CO detectors ARE DIFFERENT Models even though they look the same)  
Longer range between sensors and Base Station(about 800 feet straight line of sight in perfect conditions, about twice as far as the SS2).
The new KeyPad screen and buttons light-up automatically and you can name sensors and adjust when they are deactivated/active...actually everything the old USB KeyChain Remote was for you can just do directly on the new Keypad now and More. There is an "Instant trigger" function for each sensor.
SS3 Base Stations each have Verizon CAT-M1 cellular modules already installed, it's what gets them to connect to your SimpliSafe account without needing Wi-Fi.
*CALLING ALL SS2 users; call SimpliSafe Support and get the Verizon CAT-M1 module sent to you. There are important reasons to get it in your SS2 Base Stations. There is no cost except several minutes on the phone and then physically installing it in your Base Station.*  
The SimpliSafe SmartLock (Deadbolt controlling motor) is only compatible with the SS3 model Base Station. August Locks are compatible with both SS2 and SS3.

Also, the signals in SS3 are encrypted, SS2 is not.  SS3 uses Wi-Fi as primary communication and cellular as backup, SS2 uses cellular as primary and land line as sort of backup.  SS3 can have new code loaded, SS2 cannot.  SS3 external siren is fully integrated, SS2 siren is not.

If both are connected, then Wi-Fi is used.  That makes wi-fi primary by definition