It's probably the worst time of year for a banana to bloom, growing conditions now are marginal at best, and it will only get colder over the next few weeks to month. Not much will happen over the winter, but if there's no frost this year, the bananas should fill out and mature eventually during the spring or summer. Their flavor might be affected by the cold though.
EDIT: Just looked at the forecast, and it looks like I'm in for some nice warm weather in early December!
