I doubt any full repaint of the 458s (or HC 450/5s) will take place until a decision has been made on what stock will be used on the 10-car Windsor Line services. If it's Junipers, then the 458s (and 460s) are in line for a major rebuild and would emerge afterwards as 5-car units in SWT suburban red, complete with new cabs.
I think the 458s are having the paintwork touched up. The paint isn't that bad, so with a thorough clean and a reapplication of the orange stripe (in the lower blue band) plus other vinyls being replaced as necessary the units will look quite acceptable.