So how will Malak be unlocked?

For a small fee he will magically appear in your character roster.

I figure either marquee or a legendary event. They may have us use Sith Empire to get him instead of Old Republic though just to add a pay wall with many not getting Darth Revan the first time around.

Sell your house and max out 2 credit cards. He is yours, no event needed.

It will probably be a legendary event. Save those crystals.

I'm calling it now, Sith Empire needed. With how difficult the event is, the new gear, and friggin Carth shards not dropping the only way CG could milk anymore money out of us is to have Malak require a brand new faction who's center piece many won't unlock this time around.

Marquee, then legendary for Valkorian/Vitiate

Handled similarly to Thrawn. Sith empire ships and characters required.

Hands down marauder and sith assassin. Most likely fallen. The others are questionably revan and ...trooper?

I'm thinking whatever it is needs a ship as he is likely going to have the chimera equivalent.

A Wicket/Talzin style event that requires one or both Revans