What I can tell you about the Season 5 premiere of 'Mad Men'

As per Matthew Weiner's instructions regarding a potential review of Sunday night's two-hour Season 5 premiere of "Mad Men" on AMC, there's not an awful lot I'm allowed to tell you.

Things I specifically can't tell you:

- I can't tell you what year Season 5 is set in, though it has already been spoiled by many outlets that "Mad Men" creator Weiner removed a Dusty Springfield song called "The Look of Love" from the episode because it was pointed out by some critics that the song was not released during the timeframe of the episode. So if you Sherlocks want to know the year badly enough, Google away. (Season 4 took place in 1965.)

- I'm not supposed to tell you anything about Don and Megan. Or Don and Faye. Or Don and anybody.

- I shouldn't tell you about Joan and any hypothetical baby of Roger's she may or may not have had. Or about January Jones' real life baby (still puzzling over that one).

- And I won't tell you what's going to happen to Sterling Cooper Draper Price without the Lucky Strike account. Because I literally can't. That pretty large question is not answered in Sunday's episode.

And just in general, I suppose I shouldn't tell you much else about the episode because it would make your own viewing of it less special.

But ... what I can tell you about tonight's episode without fear of retribution:

It's really great.

Megan, the French-Canadian secretary to whom Don proposed at the end of Season 4, is a wonderful addition to the cast (in whatever capacity she may appear, ahem). And I for one dig the "groovier" vibe slipping into the show as the 1960s progress.

Also, the show will finally -- finally -- acknowledge the existence of black people in a way other than in the role of domestic help. The final scene of Sunday's episode struck me as so full of hope and the promise of change that it made my heart swell a little.

A bit of advice: Since it's been a whopping 525 days since Season 4 ended, it may not be a bad idea to brush up on the show before you watch the premiere (Sunday's episode has a continuation of a storyline involving Pete and his wife Trudy that I had absolutely no recollection of!). Several sites have posted Season 4 recaps. This Daily Beast article is a good one.

Sunday's two-hour "Mad Men" premiere starts at 9 p.m. and will move to its regular 10 p.m. timeslot next Sunday.