There may not be scrolls of town portal....but I used that ability several times during the beta.
It seemed to work just like the scrolls did. Not sure about how often I could use it or how to regain the ability. I failed to take notice of those details.
you may have missed the several-seconds delay when opening a town portal. They're useless for making a quick escape.
LightPhoenix has it exactly right: Every class gets its own 'panic button' skill to make a quick escape, and the most dangerous situations seem to come up when you're flooded by monsters, so the best skills are the ones with some AoE.
I particularly enjoyed skills with rune effects that have a chance to trigger secondary explosions of some kind.
I was also quite surprised by my preferences regarding the character classes: Witch Doctor is ridiculously cool, Demon Hunter my second favorite. Wizard is rather lame and Barbarian only a bit better. Monk's firmly in the middle.
Obviously, I prefer a kind of relaxed gameplay, i.e. killing stuff from afar; melee classes have a tendency to be more stressing (which might cause more action-oriented players to prefer them to ranged classes).
Of course the Beta was very, very easy and rather short (only part of Act1, max level 13), so my preferences may well change. But I'm going to play every class to level 60 anyway...
I'm definitely looking forward to it and I'm glad my ancient hardware is sufficient to play.