Yes solo is possible in PVE and PVP. There are times when it is better to group but for the most part I foud solo PVE to be better, excluding dungeons which need a group of about 6. Also PQs which you can do solo as in not grouping, but need other…
I think it will do very well. I am in the beta and it is an awesome game, lots of fun. People who are looking for something different than WoW would find a lot to be happy about with WAR.
As far as I can figure out you should get the code to allow you early access with your pre-order. However it will cost you $5 but you will receive 10 days of game play out of it.