Very useful, thanks. Was going off the wikipedia list for a random 360 game that I thought unlikely to be available digitally. Imagine the Official list you've linked will be more accurate.
Handy to know though. My thought was it could be cheaper to get second hand copies of the games at CEX and stuff rather than the digital copies, though not sure it would be enough of a saving to cover the additional cost of the X over the S. Do wonder if the second hand market will be effected with prices staying quite high for desirable titles for the first few months of the release of the new console. I do have a lot of Original and 360 games at my parents that I might fancy playing in the future, so that might force my hand too.