The speed you get on LTE depends on both the congestion of the cell and the strength of the signal you get from that cell. I thought the iPad can only tell what the strength of the signal, that cell towers don't report levels of congestion (excluding when they are too congested to operate). I don't think telecommunications companies would be willing to let consumers see how congested their network is either, they want consumers to see 5 bars all the time.

I don't think the 1.2% increase in heat will actually bother many consumers in the real world.

That's the same price as an iPad 2. The 10.1 may have a better screen but the iOS app ecosystem has quite a bit of percieved value. The value just isnt there for the average customer. Customers looking for a cheap, light tablet will get a Kindle Fire and customers looking for the best experience will get an iPad 3. There just isn't a market for $400 android tablets at the moment.