The Sands of Time, Two Thrones, and Warrior Within will be downloadable via the PlayStation Store. HD remakes of Splinter Cell in the works.
You can buy all 3 on a shiny Blu-ray disc, if you live in Europe, or get them all or individually via PSN when it launches this holiday. Ubisoft CEO Yves Guillemot also announced the first 3 Splinter Cells will get their own HD collection retailed some time.
They've also got a remake of Beyond Good & Evil due in 2011.