With the Hero being 18mos old I think a lot of people are coming up on their 1 year and looking for their next phone. Similar to how a lot of initial EVO adopters were early Hero adopters, we are the crowd who got the Hero 6 months late.
The Skype video chat just went live last week on Iphone4 so I assume it will be not too long for it to be on Android, that is what happened with Skype Voice chat as well. (Although Verizon had that by itself the apk from Verizon was able to be run on other phones, it is what I use on my Hero now)
From a battery perspective, I thought the Hero battery was compatible with the Evo, and along with ROM/Kernal tweaks the Evo battery wasn't horrible. Add in a second battery and you should be pretty good.
Now it would be even better with the shift, just not sure if I want to wait the 2 months for the modding community to pick it up in full stride if it ever does.
I need to get both in my hand to compare them soon and play with them. I really want 2.2 Sense which wasn't able to be achieved on the Hero. Unlike others I really like Sense for it's integration and I don't feel it slows the system down. Nfinites Roms on the Hero with sense worked great with a Zen Kernal.
Remember the name...