Just to see what they would say, I opened a TAC with Cisco Support asking if they have or were planning to develop a VPN client for Android. Here's their reply. It sounds like one is in the works, but unfortunately we have no idea on when it'll be available.
I was doing some research and I found that Cisco don't have any VPN Client for Android OS, they will develop one but I don't know when it will be ready, I found that some people was able to get it connected but no-one passed traffic successfully, so well right now the only option that we have is the L2TP native VPN Client but not sure if works well with the Android OS. Please let me know if there is anything else that I can help you with.
Thanks and regards
Christian AlpizarVPN TeamCisco TAC Support Engineer