http://blog.sitcomsonline.com/2013/07/usa-network-fall-2013-schedule-with.html

Will the Necessary Roughness finale air with Royal Pains on the 11th? And when will White Collar's fall premiere date be announced?

More premiere dates, White Collar and Covert Affairs are moving to Thursdays.
http://tvbythenumbers.zap2it.com/2013/08/15/usa-netiwork-announces-fall-programming-premiere-dates-including-modern-family-white-collar-psych/197737/#comment-1529689

Is Modern Family gonna air once a week on Tuesdays or...?

No....we posted that it will air almost every day:

http://blog.sitcomsonline.com/2013/07/usa-network-fall-2013-schedule-with.html