This is a hard one. I went down the list really thinking what I would "actually use".
HDMI out- I would use it and love it put it would be just a cool add on...
Rear camera- seriously, I hardly use my phone's camera much and when I do, I'm not going to have my TouchPad around...
SD/MicroSD card reader- the only use for this is ether expandable (but slower) memory.
Netflix- I think that this app is bound to come out anyway via app cataloge. EDIT: It WILL be coming out as the didn't mention it but they did have it in the Launch Event slide show and if Netflix wasn't in on that HP would have been sewed.
Removeable battery- this would make it bigger and fatter at the expense of having a second battery that would cost a trillion $$$..
Hardware keyboard- as above, it would just make is fatter and it wouldn't a pad anymore it would be a weird labtop thing like the Atrix 4G thing...
Gesture Area- this would be really nice. However, I think that were they are going with Enyo is a much better direction were you don't have to go down and swipe every time you want to back a page. *Eliminate Work To Get It To Work*
USB port- this is what I choose because I would actually use this is an everyday basis, because I would have no need for my desktop anymore. Every single one of my USB devices would work with it and everything I do on my labtop can now be done on my TouchPad.
4G/LTE- I have an Evo 4G currently. 4G is awesome and fast but it just isn't what it is built up to be by the carriers. Don't get me wrong, its awesome. It just isn't something that should be drawn like a gun by the carriers. The biggest pay off for 4G is marketing.. not the actual 4th G. he he
Launch Date- tempting... but my contract is up in July and I'm switching to Verizon from Sprint when it is. So all my gadget buying will be around then when it WILL be out.