It was a Dragon Magazine parody 'NPC' class for AD&D in an April Fools issue (more than one, IIRC). The sub-class in UA is a take on a 2e kit.
Hopefully we get a more amusing, true-to-the-original class some April.
Not trying - at least, not significantly more nor less than they were 3.5 fans or grognards in 2008. Though, if we get two years out, or see a PH2 or similar expansion resource, and still nothing...
Multiple attacks have always been problematic. Extra Attack and the variety of available bonus attacks, not to mention Haste and Action Surge can all produce some very high DPR. But, as an action-economy thing, they're pretty tame. Even at-will granting of a full action wouldn't be all that broken, if the class able to do so had good enough actions of his own to perform.
The 4e Warlord didn't at-will grant standard actions, though, just basic attacks. The 5e equivalent would be a single attack. Spending an action to grant a single attack, even at-will, would go from situationally good and potentially abuseable with very specific builds at low level, to noticeably weak as multiple attacks come into play (as early as 5th). Making the attack weaker or more limited at apprentice tier (lower damage bonus, for instance), but beefing it up some starting at 5th (an additional die per 5 levels, for instance), would probably work out OK.
That is, if 5e were all that concerned about 'balance' in the first place... as it stands, DM's are Empowered to deal with balance issues as they crop up, anyway, so it's not a big concern in designing a class.