The potential for that kind of linked backstory would definitely make the relationship between Boba Fett and Fennec Shand that much more meaningful. Boba had been working with Aurra Sing as a kind of mentor, but that situation fell apart because he had significant differences with her because of her brutality. Fennec Shand might be a bounty hunter, but she seems like she might have more of a code than Aurra, who just seems like an outright assassin. That shared sense of honor, as it might be for bounty hunters, could be something that Fennec and Boba Fett share.
The Kaminoan facility on Bora Vio does seem like another clue about secret cloning operations. The failed clone that came out of the one tank evoked thoughts of a certain Sequel Trilogy character. Truthfully, it's nice to see some threads being sewn through the current entertainment that lead towards where the ST would be (where you don't have to read the Aftermath novels).