True, but ambient temp in this case would be your sauna of a room's temp. Even outside, it's only about 28C. What if you use air-conditioning full time?
Well, you would have to mod the backlit keyboard yourself and it will void your warranty.
Yes, the UX32 is coming soon but it probably wouldn't be equipped with a 256GB SSD and will instead rely on hybrid HDD. However, you do gain a higher resolution FullHD display, discrete GPU in the form of a GT620M and the Ivy Bridge CPU.

So it's really up to you, Personally I would say wait for what is to come. The current pricing for the 256GB UX31 is about RM4.5k.

Hybrid HDD is a HDD with some flash memory. For example, the Seagate Momentus XT. It's a 750GB 7.200 rpm HDD with a 8GB flash cache. Performance wise it's faster than a HDD but still slower than the SSDs. So it's a good trade off of speed and capacity.

Well, not entirely sure yet, probably in a month or two.

Probably would be cheaper than the current 1st gen models. Though by how much, that is to be seen.

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Added on May 20, 2012, 10:14 pm

N56 has already been released. However, out of your budget and the local SKU is still weaker than the N5 series it's replacing.