I am still learning. So it is possible to get UHD without a 4K tv?You omitted the "S" to distinguish the new line from the existing XBox One and the forthcoming Scorpio.
Yes, it will be a native (no upscaling) UHD blu-ray player with HDR-10. However, that doesn't prevent the XBox One S from potentially upscaling other sources (apps, HD blu-ray, and games) to UHD, we'll have to see when it comes out in late August. Some have criticized the audio output features as being crippled (no bitstream), we'll have to confirm that in the future, too.
Note that I didn't use the term 4K because is a little bit of a misnomer (look it up), although we see the consumer industry regularly use 4K interchangeably with UHD.