There was an interesting article I read responding to speculations about foreshadowing of major DC comics events. Essentially, the article said: "No way will DC allow the CW to build up a bunch of connected series that culminates in something like an Infinite Crisis 2-hour special event, because that would take away from what they want to do with the movies." So it is interesting to see things that clearly reference major events in the comics, with the knowledge that the article is probably correct - the CW's scope is just not high enough on the DC totem pole to warrant big things like that.
DC have hinted that with Arrow and Flash and Gotham and Constatine (even on different networks) that they're wanting to build to a shared DC TV universe separate and distinct from the DC Movie Universe. And it has also been hinted (speculated, teased, or kidded about) that the *ultimate* goal was to build to a Justice League TV event.
If they really wanted to go all out, they could do a Crisis where the old movies, new movies, current TV, old TV and cartoons all crossover, with each being a separate reality. Michael Keaton Batman meets Christian Bale Batman meets Adam West Batman... Oh the mind reels!
Of course, all of that is silly and completely impossible to actually pull off. But, it would be fun!