We still have mixed feelings about Google+. With Facebook and Twitter so prolific, it's hard to get excited about sinking time into another social network. That aside, its new features do look a lot more Facebook-eqsue.

The new Events feature, as its name suggests, allows you to collaborate on an event. You can send and accept invites, and see feedback live as folks discuss. Google then goes a step further and sorts the image you see cleverly. When you go to browse pictures from any given Event, the most commented-on shots are located up top. Then, you see pictures that others have tagged with you in them. After that, Google analyzes the degree of previous interaction you've had with friends attending the event and orders them appropriately.

Google+ History is in beta at this point, but it looks interesting. You're able to post your current activity, similar to Facebook. But you then use circles to designate permission levels. Let's say I'm reading "Cold War" by John Gaddis during work hours. I can put this in my Google+ profile, but I don't have to let my boss know.
We really need manufacturer black list for bad upgraders!
It'll be great if we can increase UI smoothness without significant cost of battery, I'll upgrade to JB in a heart beat. But I value battery life > "smoothness".
I thought they're giving out Galaxy Nexus preinstalled with JB at Google IO, can't someone run the battery life against the "old" Galaxy Nexus on ICS.
That's a good point. Seriously, the battery life problem in mobile electronics needs some real attention here in the next couple years. Smoothness on phones and tablets doesn't need too many more improvements for quite some time, it's the battery life people!
Now I just hope I'm not left hanging for a JB update on my Nexus S, like with ICS.
Because promising an update and only delivering for 1/3 of the models, and leaving the other two hanging for another 5 months with no feedback was definitely a great experience
I installed the JB ROM on my VZW Nexus, and I'm not noticing much of a difference so far (it was pretty terrible on 4.0.4). We'll have to wait for conclusive tests to determine the real draw on battery.
Some things will inherently draw more battery - Google Now is great, but to get the maximum utility the GPS needs to be left on so it can recommend Places literally right next to you.
The experience overall is significantly smoother than ICS was, so I'm looking forward to the actual release and the tweaks in the incremental updates.
In regards to the Nexus 7 - this is an amazing tablet. It does more than the Fire does, and the only thing it can't do is Amazon Instant Streaming (which in reality is basically Netflix's library). I owned a Fire and though it was a huge letdown from day 1; ended up with the Nook Tablet and felt the device and OS were much better crafted, just lacking in content.
Google needs a way to force every manufacturer to make their phones at least 4.0... Tired of LG king n update every century.
IPad spellcheck is very finicky.