Will the X1system support 2 streaming devices (Samsung S2) looking at 2 different recorded programs at the same time?
Yes, with Cloud DVR and X1 you can watch programs on up to 5 devices simultaneously. With "TV Go" On Demand or Live content (the type of live and on demand that is available outside your home) there is a limit of 3 simultaneous streams due to contractual restrictions.
So, short answer: Yes! Enjoy!