Considering i already own editions of ICO and SOTC a re-release on the ps2 doesnt interest me... unless they brought them out even as a digital download on to the ps3, at least then i could finally get rid of my ps2.
A HD update would be nice... but Team Ico are too small a developer to expend energy on such an upgrade while they are still aiming for a 2010 release of the last gaurdian. Unless some other group takes control of it. I would love to see SOTC with smoother framrate and crisper resolution but i won't expect it. As people already mentioned SoTC never got the sales of other such titles that have had HD updates.
Still, fingers crossed.