I love the forerunner 10. Hubby bought it for me (after a few hints though!). No HRM and no facility to set one up with this later on I don't think, but there's more colour choice now, and I also have small wrists and this one fits perfectly.
I got an email from run for all about it, and have registered. It's on 12 April, and on their registration page they ask if you were one of the entrants from this year's race, so maybe they're sorting something out for that, can't remember how things were left with that as I didn't enter this year.
The 3 day event in Tenby was on tv last Saturday, and the guy who won was wearing his headphones for the marathon stage. Took them off round the final corner as I remember, but he did have the bike and cameraman with him, so not all on his lonesome. Looked up the rules whilst watching it, which asked runners not to wear them, yet the event home page has a picture of a young lady with them! Obviously didn't affect his race. Don't know what he was listening to though.