15 drivers so far announced for F1 2014, leaving 7 seats still to be officially confirmed...

Confirmed 2014 F1 drivers:

Sebastian Vettel Germany Red Bull-Renault
(Confirmed until the end of 2015) Daniel Ricciardo Australia Red Bull-Renault
(Signed multi-year deal in September 2013, contract length not officially announced, but believed to be for 'at least' three years).

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Lewis Hamilton Britain Mercedes-Mercedes
(Deal expires at end of 2015) Nico Rosberg Germany Mercedes-Mercedes
(Signed 'multi-year deal' in November 2011)

Fernando Alonso Spain Ferrari-Ferrari
(Contract runs until the end of 2016, but no doubt with clauses). Kimi Raikkonen Finland Ferrari-Ferrari
(Signed two year deal in September 2013)

Romain Grosjean French Lotus-Renault
(Signed deal for 2014, contract length not announced) Pastor Maldonado Venezuela Lotus-Renault
(Signed deal for 2014, contract length not announced)

Jenson Button Britain McLaren-Mercedes
(Signed 'multi-year deal' in October 2011. Confirmed for 2014 in Korea) Kevin Magnussen Denmark McLaren-Mercedes
(Signed for McLaren in November ahead of the United States Grand Prix - contract length not revealed)

Jean-Eric Vergne France Toro Rosso-Renault
(Signed deal for 2013, contract length not announced. Since confirmed for 2014) Daniil Kvyat Russia Toro Rosso-Renault
(Signed deal for 2014 in October 2013. Contract length not announced)

Felipe Massa Brazil Williams-Mercedes
(Signed 'multi-year deal' in November 2013) Valtteri Bottas Finland Williams-Mercedes
(Signed deal for 2013, contract length not announced. Since confirmed for 2014)

Jules Bianchi France Marussia-Ferrari
(Signed deal for 2014, contract length not announced)

Still to be confirmed / Likely candidates for remaining seats...:

Nico Hulkenberg Germany Force India-Mercedes
(Tipped to go to Force India - or possibly remain at Sauber after failing to land the Lotus drive) Sergio Perez Mexico Force India-Mercedes
(May go to Force India - or possibly re-join Sauber) Adrian Sutil Germany Force India-Mercedes
(May stay on at Force India. Has also been linked to Sauber) Paul di Resta Britain Force India-Mercedes
(Could stay on at Force India, although most believe he will end up the odd one out and be forced to return to the DTM or switch to IndyCar)

Sergey Sirotkin Russia Sauber-Ferrari
(Was expected to drive for Sauber in 2014, subject to securing a super licence - although now not thought to be so certain...) Esteban Gutierrez Mexico Sauber-Ferrari
(Signed deal for 2013, contract length not announced. Has been linked to Marussia if he is dropped - as expected - by Sauber) Vitaly Petrov Russia Sauber-Ferrari
(Rumoured to be in frame due to the arrival of Russian backers at the Swiss team...)

Charles Pic France Caterham-Renault
(Signed 'multi-year deal' in November 2012) Giedo van der Garde Netherlands Caterham-Renault
(Signed deal for 2013, contract length not announced) Heikki Kovalainen Finland Caterham-Renault
(Rumoured to be in the frame to return...)

Max Chilton Britain Marussia-Ferrari
(Signed deal for 2013, one-year deal only)

Retirement

Mark Webber Australia
(Heading to sportscars with Porsche).