As far as I know, support isn't in 3.5 or even the 3.6 release candidate. It may, however be in the 3.6 final release, but I don't really know.
If you're right that the NX200 and NX100 share a same format, you can do what other impatient photographers have done with other cameras: hack the images from your camera to look to Lightroom like NX100 files. There's a text field inside the file somewhere that you can change with a hex editor to make it look like the other camera.
You'll need to figure out the details and do a bit of experimenting. Do it on a copy of the file, in case you mess up.
On the other hand, you could shoot JPG until LR supports your raw files (which may be as soon as 3.6 final). Jpegs aren't that bad really. Can your camera shoot raw+JPG? You could import the JPGs now and the raws later.
No, they are not the same raw format, despite having the same file extension. There are many similarities, certainly, but not the same. NX200 users would be very unhappy if we (Adobe) tried to use the same interpretation for NX100 processing as for NX200 processing.
I do in RAW, than import SRW to Samsung Raw Converter. I set the correct white balance, sharpen. and exports to TIFF.
After a suitable set of parameters is somewhat smaller TIF - so it will retain all of them do DNG.
It seems to me that the TIF has better quality than JPG.
Anyway I look forward to the support for SRW from NX200
When can we expect the Samsung NX200 to be supported by the DNG converter?
There is support for NX200 in new ACR 6.6
SRW files after converting are about 15MB!!
And also in LR 3.6
Alredy converted more than 1000 files