Spice Girls, 'Right Back at Ya'

I think there is quite a reasonable chance that the Spice Girls will re-form this year - there are large sums of money being offered to them (allegedly approx 10m each for a tour).

If this happens (currently quoted at 4-1), will they release a new song to promote it? (and will this song get to No.1?)

If you think this is a possibility (and I do) the 66-1 at Will Hill on the Spice Girls reforming (min 3 members) and releasing a new record that reaches No1 looks very big... I am having 1 pt on this.