AI and PDF compatibility will both be present in the product we launch with - which is what the website is trying to describe to interested potential users. The beta will also get these features very soon, so I don't see the problem?
We can't expect users to keep checking back on the website to see if we've added any new features that we always knew were going to be in the finished product but hadn't listed, just because they weren't finished yet, surely?
It's a sales site, deep down we understand why you did what you did and why you say what you say. We have all done it in the past. But there is always that dick that wants to pick a bone.
Don't worry about it. Though I would probably try be abit more upfront about the beta and the limitations of the beta at the download phase. After you have collected email addresses etc just let the user know this is indeed beta software and it's missing x, y and z.
Considering your early adopters are going to be more adventurous.. then it might make sense to post detailed release notes.
This serves a double purpose. It means you are upfront with your current users (likely to be your first paid customers) and it sets the tone for open communication.
Said tone is awfully important. It's the difference between "I'll report this bug and it will probably be fixed 2 weeks from now" and "F$#k it, these guys don't give a sh*t". Not to say the latter will necessarily happen but only that tone counts for alot when you are selling a tool that peoples livelihood may very well depend upon.
Best of luck anyways. I love working with graphics on the Mac and think your product is a welcome addition.