I've discovered another discrepancy:
I set up a Google+ community for Kobo Arc users with Google+ new community feature. I can access Communities using the G+ app on my iPhone, iPad, and of course, from any browser. When I use the G+ app on the Kobo Arc, the community feature doesn't seem to be enabled.
I thought maybe it was just an ICS issue, but I asked a friend who is using a phone with ICS installed, and he said he can see the community feature just fine.
I went to Google Play to read the page for G+, and it says the most recent version of the G+ app "varies based on device".
Can any of you check to see if you see "Communities" in Google+ on your Arc? Thanks!