Same here. Nine hours since last successful log in. While inspecting the network during login process there is a few HTTP 502 responses. Seems like some blockchain.info's server is down. No any official update on that.
P.S.: Transferred my coins away from BC.I to stay safe
UPDATE: It works for me now

I heard about DDOS attack to some wallet sites.Maybe that is the reason for unaccessible wallet concerns. Did you check to open browser's incognito mode which works flawlessly without old cookies? I hope you dont hold all your bitcoins in single web wallet.