Not sure the wait is going to be worth it personally. MS have shown with the original Xbox, that as soon as new hardware hits, they will drop support for the older stuff in a heartbeat.
Smartglass is showing that WP7.5 isn't a priority. Of the games I have tried functionality on, none work properly as you either need WP8 or an iPhone.
Rather depressing that as a WP7.5 user, I can't access features that are readily available to iPhone owners. Well done Microsoft for already alienating those of us who bought Windows Phones and tried to make it a success :/