Well, thanks for a lot of feedback!

I'm really thinking about a laptop with a touchscreen. It'd be great to have a device for comfortable reading of pdf ebooks (the e-readers don't cope well with them).

AFAIK, now there are apps for interpreting the touch gestures (e.g. touchegg) for Linux, even if the DE doesn't provide a sane support. So wouldn't be forced to switch to Windoze

What's more, the law in Poland is such, that you may simply refuse to take the Windows with your computer and the seller has to give you the money difference back (at least it was so a couple of years ago). So, most probably, I'll stay with a touch-enabled Linux distro, most probably Mint + MATE.

Are there any key features that a touch laptop should have? Detached kbd?