No native e-mail support is a big thing. Tablets are becoming more and more popular in companies and having proper caldendar, contacts, e-mail and task support is important. Having the ability to connect to Exchange via activesync is also important. Blackberry is shooting themselves in the foot.
How many times have we heard companies say that support would be added later, only to wait ridiculous amounts of time after purchasing it only to find out the feature will not be available after all, or you will need to purchase the new version of the device to get it.
My advice to you is this, buy it for what it is as it stands now if you must, not for what they promise down the road.