The 13 is generally busier between Leven and Buckhaven. Not so much an issue during the day as there will still be 48/48A 49 49A 6/6A/6B. That said, areas in Methil/Buckhaven such as Oakvale Road, Poplar Road, "The Bird Scheme" and Barony and Lower East Wemyss will have no service.
In the evenings and on Sundays there will be no direct service to/from Kirkcaldy for areas like Starkie's Woods, Methilhill, Kirkland Walk (apart from a few X27s which have limited stopping points). This is where the public will miss service 13 most, I suspect. I think the 44A will be serving past the bus depot and along Kirkland Walk.
As far as Olympians are concerned, St.Andrews still has 16165 16166 & 16178, although days are obviously numbered now. Interestingly it would appear 16163 has been given to Methil fire station. 16132 is still at Aberhill. 16230 also, which is an S reg and still has until October if memory serves me correctly.
There are a few ex-London Tridents being prepared for service in Aberhill depot and I assume these will replace some of the Olympians. A mix of V X Y 51 & 52 plates. Some of the fleet numbers (forgive me as these are from memory!) 17113 17347 17579.
I've also heard a rumour that Aberhill are getting new Optares to be used on X4 43A 44A and 32 routes. I assume there will be some fleet movements in August to co-incide with the service revisions.