The next generation of the Sentinel program promises a definitive containment of the mutant threat
Responding to the rise of mutant rebels, Trask Laboratories unveils the next generation in its Sentinel line — the Sentinel Mark X. Among the new model’s many upgrades is its ability to shape shift and physically adapt to environments.
Note: Fan-theory - Rogue was not seen with Iceman during the protest 2 years ago. It is likely that sometime before then, Rogue has been imprisoned, and her DNA has also been used like Mystique's. While Sentinels can change form because of Mystique, it is possible that they are able to change power sets because of Rogue.