The strictures that were observed during the Nine Days apply to the night following Tisha B’Av and the next day until hallachic noon (Chatzos). Therefore, one does not wat meat, drink wine, launder clothes, take a haircut or take a hot shower etc. until chatzos the next day. (Shulchan Aruch 558:1 and Mishnah Berurah 3)

This year since Tisha B’Av fell on Shabbos and the fast was observed on Sunday (the Tenth of Av) one need not observe the strictures of the nine days on the night after the fast. Therefore, one may launder clothing, take a hot shower and take a hairtcut tonight (Sunday night). However, one should avoid meat and wine until midday tomorrow. (ibid.) Sefardim may eat meat and wine tonight (since the fast was postponed from Shabbos to Sunday) (Birchei Yosef 558:2)

Most authorities maintain that one may drink wine during Havdala, and according to those authorities the Havdala should be recited over wine. However, the Aruch Hashulchan (556:2) maintains that tonight one should make Havdala over chamar medina (beer, acc. to some milk, orange juice etc.)