For Black Panther?
Wakanda's languages being built up, like we've seen with tlhIngan Hol in the Star Trek worlds.
Yes, I expect Wakanda has more than one locally-evolved language. Certainly, they've picked up words from other African languages over the centuries. And being a coalition of cultures that take pride in knowledge, many of even their most traditionalist tribes make certain to be fluent in multiple tongues. Yet it's been long-established that there is at least one language the Wakandans truly call their own. And reality in linguistics being what it is, history and logic suggest there should be more than the one.
For Agents of SHIELD and its collection of related titles?
A guide to the organization itself. Current writer Marc Guggenheim has Coulson recently claiming that he works for Washington, mere months after Mark Waid portrays him as insisting that the "H for Homeland" more accurately means "Homeworld". In Civil War II # 0, Brian Michael Bendis reminds us of the organization's United Nations connections.
Outside of their own series, we have at least one of their agents, Mockingbird headlining her own book. (About damn time!) Both Captains America titles, Sam Wilson and Steve Rogers, have ongoing relationships with the organization. Howling Commandos of SHIELD recently wrapped up some of the adventures of their supernatural interventions via the STAKE division. Black Widow has an on-again-off-again work relationship with SHIELD (currently "off", but don't expect that to last forever). The organization shares the Triskelion complex in New York Harbor with the current incarnation of the Ultimates...and on it goes.
(Don't get me started again on their Helicarriers and "Battlecarriers". Not right now. If you've seen my Pericles Project folder on Flickr, you know how much enthusiasm I can pour into that topic.)
We need a handbook to the organization itself. An "Agent Orientation Manual" if you will. No need to get into the minutiae of clauses of international treaties and internal regulations that should govern SHIELD, but something that nails down the current "broad strokes" of its history, current prominent personnel-characters, technology, operations, adversaries and methods.
For Alpha Flight, now pent up in the pages of Captain Marvel?
A better understanding of how what began as a government-run superhero team tied to my home country became an international planetary defence force. That seems to be slowly unfolding. I await developments with interest.
More as I mull it over.