Sorry mate, I totally forgot to answer! Hope it's not too late, here goes:
As far as camping is concerned, I only have experience with Rock Werchter, but I can tell you Lowlands camping is very well-organised. Most campings have 24h showers and all campings have a camping shop for food & drinks (cold cans of beer). There's also a camping shop if you need a new sleeping bag, air mattress, poncho's or other utilities.
Where the camping is different than RW's is that the camping is an integral part of the festival. Since they only sell weekend tickets including camping, I'd say 90% of the festival goers (maybe more) are camping at the festival. When you arrive, there's one large security checkpoint where all your luggage is checked and where you receive your festival wristband. From there, everything is really relaxed. No checks when you go from camping to the festival arena for instance. There is security on entering the arena, but they will only stop you when they see you bringing stuff in that's prohibited in the arena, like large backpacks or your own drinks.
Beer: 1 token is 1 (small) beer indeed. Large beer is 1.5 or 2 tokens, can't really remember :)))
On Thursday, one of the three 'main areas' of the festival arena is already open. I've never been there this early since they do it this way, but I hear there is a slient disco area (very crowded though) and bars are open in that section of the festival. Don't know if there is any music or parties besided that silent disco area.
I'm not going this year (chose BKS and RW), but I feel the lineup is a bit lean still... Kendrick and Gorillaz are great headliners, but apart from some other personal indie favorites (TWOD, Grizzly Bear, Protomartyr, Bonobo, King Gizz for instance) it's still a bit lacking for me personally. However, with one or two fairly substantial waves of confirmations I expect still to come and always lots of interesting smaller names to discover, they always manage to keep me running from one stage to the other for three days straight, so I never worry about their line-up.
Hope this helps, just fire away if you need to know more.
There's also some English info on the website: http://lowlands.nl/english/