It will pass Dolby EX via optical, but sehnzeleid is saying that it won't decode Dolby EX internally and output as multichannel analog. That's common - the only player I know of that has internal Dolby EX decoding is the OPPO 980H. Also, many companies have been a bit unclear about how their players support DD+, TrueHD, and DTS-HD. First, DTS-HD typically refers only to DTS-HD High Resolution, not DTS-HD Master Audio (which is the lossless form of DTS-HD, equivalent to TrueHD or raw multichannel PCM). Because DTS-HD MA isn't specifically mentioned, it's a safe bet that MA isn't supported. Second, the TrueHD thing is peculiar and unpleasantly misleading. They list it as having a TrueHD decoder, but don't mention what limitations might exist. Toshiba had a similar limitation with the HD-A1 and HD-XA1 originally, but resolved it with a firmware update. I guess there's hope that Samsung can do the same. Also, there is a lot of double-talk with players that can pass a bitstream of the new formats. Here's a blurb from Samsung's site:
They say that TrueHD is supported by HDMI v1.3, which means that it isn't supported by multichannel analog or by HDMI v1.1 - thus, all it can do is pass the bitstream to a receiver that can decode it. That sort of hints at the limitation, at the same time that it seems to contradict the specs.

Thanks Gonk for your response