If Bottas gets a full-time drive in 2013, I'm wondering who will replace him as Williams' development driver. Bottas would be the second driver promoted to a full-time race seat in three years, and both he and Nico Hulkenberg are/were highly-rated; after all, Bottas won the 2011 GP3 title. In Williams' position, there are two drivers I'd be looking at closely: Kevin Korjus and Conor Daly.
Yes, I know I placed Korjus at Toro Rosso in my predicted grid on the previous page, but that was only because I was at a loss to fill the void at Toro Rosso. If a Toro Rosso driver were promoted to Red Bull, then Toro Rosso would have a problem in the way none of the Red Bull YDP drivers - Sainz, Williamson, Kyvat, etc. - are really ready for Formula 1. So I put Korjus in.
If I were Williams, I'd be looking at Korjus because he's partnered with Jules Bianchi in Formula Renault. Bianchi is highly-rated, and is doing an FP1 programme with Force India this year. There were even rumours that Ferrari was trying to buy Kamui Kobayashi out of his Sauber seat to place Bianchi there. So if Korjus beats Bianchi in FR3.5, it's going to be a stunning endorsement of his abilities. He also tested for Lotus Renault GP at Abu Dhabi last year, and the team seemed pretty happy with him. If Williams keep going with Renault engines, then they'd get a lot of consideration with the Formula Renault teams. And he's only nineteen, so he could afford to take a season as a Williams development driver.
The other driver I would be looking at is Conor Daly. He's racing with the Lotus-branded ART Grand Prix in GP3 this season, as did Bottas last year. ART have dominated the series for the past two years, and their best-performing drivers - Rossi, Gutierrez, Bottas, Stanaway and Calado - have all gone on to big things. So Daly is in the box seat. Unfortauntely, part of this is marketing; Daly stands out because he is American, whereas his team-mates - Abt and Vainio - are German and Finnish, and there are already plenty of Germans and Finns in Formula 1.