Quote from me:
"I think this may be a SRS final target speed.."
Sorry AF330, I was using the wrong terminology, and in any case the FMGC is still in ROLL OUT mode: so logically SRS could not be displayed, nor I think any speed related to a go-around. The speed I was thinking of is the speed limit for the CLB phase. (The default is 250, but as you probably know can be pre-selected by the crew before departure.) So apologies for any confusion.
For the time being, and in the absence of the FCOM, I am not going to try a third "guess"!
So maybe you will have to wait for a proper expert to explain this one.