Yes, that's right, the new FREE Team-up for the fourth year anniversary event will be a S.H.I.E.L.D. Helicarrier according to several spoilers from Asros (Brian Waggoner). However, this Hellicarrier Team-up will not be like any other Team-up because it will only be a 100% away Team-up with powers that fire based off of signature power use, medkit use, procs, etc.
If you'd like to check out the new Helicarrier Team-up as well as other anniversary items, the Test Center is currently live! So, check it out!