there is no such thing as international lot, i haven't actually seen this 'international' lot. i think it just means that foreigner can buy , ie havne't exceed quota for foreigner. there is only Bumi lot, which must be sold to bumi only (ie locals). then there is the foreigner quota imposed on developer - means for eg housing project (SEC) 20% foreigner quota. And even those bumi lot, if unsold, can be converted to normal lot. my singaporean friend bought a bumi converted lot. there is no restriction on who you can sell it to in future, this already checked with setia lawyer. this mean that after the first developer bought transaction, the subsequent sub sale unit are only two categories ; either BUMI (which cannot be sold to foreighner) or non BUMI. There is another which is "MALAY reserved land", this one the whole development can only be sold to bumi, non bumi not allowed.
SO unless state gov't want to seriously screw up the local property market, i don't expect any such major drastic change in policy. they may increase taxes for foreighners or the state consent levy may go up, that's about it.