I currently have a PlayBook and I am thinking about doing this too.
I have had a Pre 2 for about 6 months and although it has had its problems I love it, I love webOS and I love the homebrew community.
Back in March I decided to get a tablet (a choice I dont't regret); iOS and Android weren't doing it for me due to their poor multi tasking / app switching, and as I'm sure everyone here agrees - once you've had a taste of cards you can't go without them. The TP was still some way off release and I was desperate for a tablet so the PB seemed like the logical choice.
I do like my PB, there are things I dislike about it but then there are also things I dislike about the TP.
On the PB launch day I was willing to accept its shortcomings under the assumption that updates were just around the corner (within 60 days was the original promise) but here we are 3 months in and I'm slowly starting to resent RIM, feeling like they just don't have a clue what they are doing anymore - which is a shame because the PB is a great product and has a huge potential.
I'm tempted to jump ship but I don't want to make the same mistake again, so once HP have proven that they can live up to their promises unlike RIM I will most likely get a TP. I will be keeping my eye on TP news and continue lurking in these forums to see how things go.
In a week or 2 we will get the update and then you shall be content with getting a TouchPad!
"Life is Hard... it's harder if your stupid"
- John Wayne