There is quite a lot of info on 4K tech itself but 4k tv and ultra hd tv are one of the same.
These are two excellent articles that explain each.
And your 10 mbps isn't fast enough to support 4K streaming. I believe only google fiber can support 4k streaming (its only available in one location though).
Whats the difference between 4K and ultra hd TV? What content is available for 4K? And I currently have a 10 mbps connection, is that enought o stream 4k content in the future?