What happened at the end of 'Mad Men'???

[sp1814]

Our Virgin Media box decided not to record the final five minutes of this week's 'Mad Men', which has left me hanging.

Can someone please tell me what (if anything) happened after the scene where Don tells Betty he's got engaged.

I read somewhere that there was going to be a big storyline involving Peggy that reveals itself at the end of the episode - what WAS that?

[ABerrant]

http://www.bbc.co.uk/...eries_4_Tomorrowland/