Avengers: Age Of Ultron Ending - 14 Implications For Phase 3 And Beyond
7. The Last Two Infinity Stones
As Thor's vision confirmed (unsurprisingly), there are now four Infinity Stones in circulation. Guardians Of The Galaxy unearthed the Power Stone, Vision has the Mind Stone in his head, the Space Stone was in the Tesseract and the Aether from The Dark World was probably the Soul Stone.
That leaves the Time Stone and the Reality Stone, and you have to suspect that the former will appear in either the Guardians Of The Galaxy sequel or the Inhumans (with primary focus on its time travel capabilities), and Reality in Doctor Strange.
Of course it's romantic to think that the Time Stone might turn up in Captain America and see Steve wrestle with the idea of going back to his prime, but he's too noble to sacrifice an entire timeline, and he's basically just put his pining for home to bed in Age Of Ultron.