I believe you will have to wait to see- however, we do know, or, should believe, that there will be an office suite developed for the TouchPad's debut, and since the Pre 3 will debut after that, I would presume that it will be available on that, as well.
I can open up Pdfs in emails and attachments when they come to me in pdf format, and Im running 1.45 on a Pre+, so I have no idea why you are experiencing that issue. Email folders would be nice - I believe that the new TP email app is a preview of WebOS 3's email implementation, which the PRe 3 will have as well, and, you shouldnt have much to complain about with that - by most accounts of those who have seen it in action, that email application is probably the best of any mobile platform available today.
Business users want 1 thing, primarily: reliability.
After that, they need performance and security, and then, see #1 above.
With that vertical keyboard, the 3.6" capacitive screen, the 1.4 ghz cpu, and webOS 3, I think it stands an incredibly good chance at being a huge enterprise device, not to mention a smartphone for those individual users who really rely on them heavily as a part of their daily activity.
We just have to wait to see the reality of the device, when it hits the shelves this summer - specs are one thing, but, actual use/experience is really what will dictate is success or failure in the market.