RNS-D is CD based, but the later RNS-E which uses DVDs won't play DVDs either without an external unit connected as a source.
You can add a digi TV, but it'll have a hand held remote I believe as it's an external source. Not sure Audi produced a digi tuner for the RNS-D but there's plenty of info on this if you have a search 
The rear entertainment pack has a single screen in the roof lining and is Sony based. It looks like an afterthought so if you really want the full multimedia suite in your car I'd look at binning the RNS-D and going aftermarket e.g. Alpine as the integration of bluetooth/nav/digi media/TV will probably work out considerably cheaper than going factory.
Although you can pick up an RNS-E for almost sensible money now, the digi tuner boxes alone sell for almost £500 second hand! You'd still need to add additional modules for external sources so it quickly mounts up.
By the way, post an intro thread and some pics of your new purchase  be nice to see if we recognise the car
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===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD===
2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus
2015 VW Golf GTI Performance Pack in Carbon Grey with black Vienna leather, tech pack (Discovery Pro nav & Dynaudio), DCC, factory towbar and retrofit RVC
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