Well these are my guesses.

The noob signs with the coins could be Cyrax's bombs or coins to show Cages money.

The earth and the moon i just nightwolf no other explanation.

The red nmbers are to show MK 8

The lightning from the 2 earths means Raiden.

The MOST important one ppl have been thinking are Noob rain Reptile and Kabal but it is obviously VIXEN! DUH she can transform into any animal and is a key member of the Justice League also the animals are ina an African terrain and she is African.

The April fools Joke:
Someone already said the April fools day was a joke and Jokes are from Joker.

The Embargo Lifts tommorow well Embargo is some sort of political punishment which is teh ppl on the forums flaming so maybe they were releasing something good to stop ppl from flaming

It must all add up cos it says times up then it says Embargo lifts tommorow and the good thing was Daniel Day Lewis saying there will be blood is the good news.