Teams which were at the tests (and probably reached their testing limit): Netherlands, South Africa, Malaysia, Australia, New Zealand (perhaps 1 extra day to go - they finished their car later), Italy => they'll definitly be there.
Teams who presented a livery and/or drivers but didn't show at the tests: China, India, Indonesia, Ireland, Korea, Lebanon, Mexico, Monaco, Pakistan, Portugal, Switzerland. => they probably test at Snetterton tomorrow (if their cars are ready) - but how are they coming from Snetterton to Zandvoort in time?
Monaco has finished they're car cause they drove it in Monaco already. In another thread, Martin-A1 said Mexico and India aren't coming to Zandvoort.
Teams I didn't hear anything from: Brazil, Canada, USA, GBR. Rtlgp.nl announced that team GBR is not coming to Zandvoort.
Teams that won't make it anyway: Czech Republic (not even on the main page anymore) and team GER (Weber fails)
http://a1.gpgrid.com