Which home automation standards will work with Apple and/or Google's forthcoming sofware?
All that Google has, from what I know (and googled to double check), is that they own Nest.  They apparently had an "Android @ Home" project a few years ago, but I couldn't find any recent news on it.  Personally I'd bank on Apple moving in on your home before Google-- simply because they already have their framework public, so developers can already start creating apps

https://developer.apple.com/homekit/
http://9to5mac.com/2015/01/22/apple-details-homekit-compatibility-with-competing-home-automation-platforms/

Apple's HomeKit framework will only be compatible with "MFi" (made for iPhone) hardware.

Here is a nice article that recommends some hardware that will already be compatible with HomeKit apps, and claim they should also be "future-proof"

http://www.makeuseof.com/tag/future-proofing-smart-home-apple-homekit-compatibility/

Of course all of this also depends on what phone you have as well.