According to HeatVision (The Hollywood Reports Comic Blog) there was some speculation that
The Avengers might not be on track for its previously scheduled release date due to the fact of recent distribution rights news.
Now we know that even though the distribution rights have changed hands, the movie is still on schedule.
"But when Disney took over the marketing and distribution rights to “Avengers” and “Iron Man 3” for a minimum guarantee of $115 million earlier this week, there was a hanging question whether Disney would use the same date to debut the movie."
So if you are keeping track, expect to see The Avengers in theaters May 4, 2012!