It could refer to anything - there is nothing specific about the "cracked it" statement that specifically identifies anything. People are projecting a TV, but there is no evidence that is what Jobs is talking about. Plus, what if Jobs was wrong and he didn't know it and others do? What if the "solution" is something that doesn't end up practical? It may never even see the light of day.
I suggest we shouldn't look into the meaning of what is essentially a tease statement.