Just in case you don't feel like spending $30+ on a carrying case like I do not or if you just want to have a backup one for cheap that you know you will have in time for June 4th then check out eforcity.
http://www.eforcity.com/universal-ce...rry-cases.html
I ordered a horizontal leather case for my touch pro 2 from there and it has treated me excellent, so I decided to order the Horizontal Leather Case for Samsung Instinct / LG Xenon / Vu, Black for my EVO and its only 5 bucks so if I find a better one at the sprint store on June 4th its no biggie. Again I think this is a good idea since HTC will not be providing us a case in the box. I know the specs of the case arent an exact match but I think it will work fine anyways. Just thought I'd share.