There is an extension system coming soon and that will allow some additional means of integrating third-party code, but from the start only C/C++ so no AdMob support I’m afraid.
If you consider Leadbolt and AdCash as similar monetization options as AdMob then it’s possible to use them already using the recently introduced webview.
When you say analytics, which service are you thinking about specifically? Google Analytics? If so, then I’m fairly certain it’s possible to implement GA support in pure Lua using the Measurement Protocol.