Unicorn has a lot of links and references with the original series, the biggest of which include the once presumed dead/missing Minerva Lao Zabi, the last legitimate heir to the Zabi family who were the main antagonists in the original TV series. The implications of getting her support for another Neo-Zeon uprising/independence movement (depending on who you talk to) would assert the legitimacy of the movement because of

The Nahel Argama, the AEUG Flagship in ZZ Gundam returns as one of Londo Bell's main carriers. Bright Noa, captain of the White Base in the original series also appears to have a pivotal role, at least in the novel version during the Battle at the Port of Dakar, the Federation's new capital after its destruction In Lhasa, Tibet during the events of Char's Counterattack. I also love the fact that Otto Midas, the new captain of the Nahel Argama, still sports a Titans-esque uniform. Works for me since I've always been an EF lover including all of its offshoot organizations.

Kshatriya was a monster with all those funnels. Double the number of the Qubeley.

The Stark Jegan at the beginning of the OVA was a hero. I cried manly tears for him.

Too early to tell what's gonna happen with the plot, but the Laplace box that's supposed to ruin the EF when opened still remains a mystery.

The EF has a Col. Badass character! He unloads his MS rockets at the Kshatriya, steps out and fires a rocket from a hand held rocket launcher himself after. I can't wait to see more of this guy.