Seeing as Apple is unlikely (IMO) to ever release a TV, what they call it is probably irrelevant..
Why won't they release it? Look at their history. They have only ever entered markets that are relatively small, profitable and make it easy for Apple to establish their name. In the 70s and 80s, they entered (and to a large extent, created) the computer market. Then, in the early 90s, they attempted a PDA (which was then small, and largely consisted of Psion organisers). Then in the early 2000s, they attemtped a music player. While this market was larger than the PDA market of the early 90s, it was still a lot smaller than it is today, with a lot of small manufacturers, but very few large ones).
Then came their entry into the Smartphone market. Again, this was a lot smaller than it is now (in fact, most phones didn't even come with a full web-browser and WiFi connection, and even assuming they could run apps (most couldn't), they were limited. Apple came to the market with a phone that offered all that and only really lacked Apps. Then they launched the App Store and iOS SDK.
Regarding the tablet market, well, around the early 2000s, a few manufacturers had a go, but none of their products ever took off. The iPad did (despite being a large iPhone with no calling capability).
My point is that Apple has (in the past) tended to enter markets where the market is small, there aren't many players and the market has the potential to be profitable.
The TV market is large, and has hundreds of companies operating in it,, and the profit margins are minimal. Hell, even the massive multinational electronics companies are reporting massive losses in their TV manufacturing departments.