They should be able to be rooted since HTC promised to keep the bootloaders "open" with their htcdev unlock mechanism. As long as that is up, let's hope Revolutionary will be able to be ported and work
Regarding these new phones: awesome to see HTC is going to release some *very* nice smartphones!
There is one thing you guys should keep in mind when you are going to be stuck between the One X and One S.
While it may look like the One X will be far more powerful due to a quadcore soc and energy friendly (due to the extra core for background tasks), as advertised by HTC; this is actually not really true. The One S has a new line of dualcore processors by Qualcomm which performs about the same and may even perform better than the quadcore model! And the AMOLED screen will save you more energy than the extra 500Mhz core
The next problem is this, which is another thing to consider, that on the other hand: the Tegra3 GPU is superior. If HTC would have waited for the Adreno 3 series to be implemented on the Qualcomm krait setup, this problem would have been eliminated and the One S would on all accounts be a far superior phone.
So it comes down to this: What do you want?
CPU performance, a aluminium 8mm body, a AMOLED screen and a very long battery life? Get the One S!
Do you want a quadcore powered phone with higher GPU performance then CPU performance (particullary interesting for gamers) and do you not mind about a plastic body? Get the One X.
Either way, the One X is not really superior to the One S, even though HTC is advertising it as such... Keep that in mind, dont just go for the quadcore "because it is a quadcore". Make your choice wisely based on performance
The first benchmarks will come in soon...
All in all, they are two SUPER phones!
I personally will probably be going for the One S
Small, uber fast and a full alu body