just because windows 8 will be supported until 2020 doesn't mean it will run all the latest technologies till then, in fact this seems about the usual amount of time that windows OSs are usually supported.
Windows xp was supported until 2010, so this is going to have a few extra years on XP, but a lot of software and some games now now longer works on xp, it may well be an upgrade to windows 8 may be needed before 2020