I thought Battle Master was the new warlord.
Doctorbadwolf covered this nicely, but I thought I'd add:
The designers definitely said that they thought the Battlemaster
alone was not enough, back when Specialties were still a Thing. Specialties are now gone. I, personally, think it's annoying and (mildly) unfair that to approach a 5e equivalent, you absolutely
have to get at least one, and possibly as many as three feats. That means you cannot possibly get a Warlord-like experience before level 4 (ignoring Variant Human since I expect Warlords to be of many races), and possibly not until level 8...all the while, being much,
much better at doing the things Fighters do (being personally very tough and doing lots of weapon damage).
I also believe that that feeling of annoyance and unfairness, coupled with the desire to see what else can be done with the concept in a new edition with different design parameters, is a perfectly legitimate reason to ask for the class to be made. Just like how you
could model a Psion fairly easily with multiple classes (GOO Warlock, Knowledge Cleric, Diviner Wizard, especially with the 'spell point' variant rules), but it would annoy or be unfair to certain desires of Psion fans, and would fail to explore the new or alternative design directions available with this new edition. I felt the same way about the Jester class poll that went up recently.
Would I feel the same way about absolutely every suggested class? Probably not. But I would, at the very least, seriously consider whether there could be interesting new design directions for a requested/suggested full class. I would also consider one or more subclass options for current classes (whether as a "full" representative or merely a "dabbler," which is what I consider the ally-boosting variety of Battlemaster to be), and whether you could get just a "hint" or an "origin" out of the idea, to help fuel ideas for backgrounds. The last is because I believe backgrounds supplement, rather than replace, the needs/wants filled by classes and subclasses--just like how having an Entertainer background doesn't obviate the overall system need for a Bard, nor does Soldier obviate the need for a Fighter, nor Sage obviate Wizard, nor Outlander obviate Ranger, nor Acolyte obviate Cleric, etc. They provide context and a
boost to a concept, not a complete concept on their own nor in combination with any particular class or subclass.
All the options have been catered for in the rules - you just don't like them. Wizards aren't going to change anything despite your on going noise on the matter and quite right too.
Seems very odd, then, that they feel there needs to be a "psion"-type class. If the game as-is is complete and needs no modification nor extension, why address things like player dissatisfaction with the Ranger? That's why they've said they're doing it, after all, because the Ranger consistently ranks lowest on their surveys of satisfaction with the various classes.