Alien X-Tintion Trailer and New Omnitrix Revealed

Cartoon Network has released a trailer for Alien X-Tinction on their Twitter. This is the third and final special for season 5 of the Ben 10 reboot. You can watch a video about its trailer here.

Alien X in the Ben 10 reboot

Alien X-Tinction will feature Ben finding an alternate Max, and will have Ben teaming up with multiple versions of Bens and Gwens to create an alien army to combat the villainous Alien X.
Alien X resembles his Alien Force appearance, except he is much larger and has glowing green eyes. He has nine Omnitrix symbols, one on each shoulder, three on each arm and one on his left peck.
The trailer shows Ben telling Grandpa Max to avoid getting stepped on by Alien X. Ben transforms into Cannonbolt, remarking that he knows how to use his Omnitrix, Alien X replies that he also knows how to use the device, and throws Cannonbolt into the Rustbucket, crushing it. 

Alien X morphed his arm into a sharp dagger

This may hint that Alien X is actually an evil Omnitrix user, He also has nine Omnitrix symbols, and it is likely that he wants to collect reboot Ben's Omnitrix to get ten, which may grant him great power.
In the preview, Alien X uses his enhanced strength to hit away Grandpa and Cannonbolt, and used his shapeshifting abilities to morph his arm into a sharp dagger.

Alien X remarks that Max always tries to interfere, which may refer to alternate versions of Max trying to get in his way, which would line up with the mentioned Max in the synopsis. 

Ben and Grandpa appears to be camping in a forest, that lines up with the leaked forest artwork we got from this special. Since the episode takes place at night, it is possible that this other screenshot we got belong to this special.

Alien X, Grandpa Max and Ben Tennyson

In addition, it appears that the Omnitrix has received another new design, meaning that it gets upgraded in Ben Gen 10. 

Season 4 and season 5 Omnitrix comparison

According to Cartoon Network, all three season 5 specials, including Ben 10,010 and Ben Gen 10, will premiere as a three day event in the US beginning on April 9 at 10 AM. It is likely that Alien X-Tinction will be the final special and premiere on April 11 at 10 AM. You can watch the trailer here.