google is your friend!
Seems that East-West play is compatible - you have to
download the upgrade to play 3
spectrasonics is also compatible
as is all Native
Lion is quite well established now - I don't think there
are very many 'current' software titles that arn't compatible (or have an update
available) - it's some of the older programmes that arn't as forgiving!
you'll be ok -
As for mountain lion - that's not out yet, so if you buy your
Mac before Autumn, you should be ok!
As always - when upgrading, check your 3rd
party plugin manufacturers websites before hand to see whats good or what needs an upgrade