As per a press release from Norkring (in Norwegian only), the Vigra transmitter on 630 will close on June 30th, 2011, while the Røst transmitter on 675 will be left alive until December 31st, 2012 after only 13 years of service. This will leave Ingøy 153 as the only remaining AM transmitter on Norwegian mainland. Norkring's sole MW station left will be the 1 kW NRK relay at Longyearbyen, Svalbard (1485 kHz). I won't be surprised if its days are numbered too.
Thanks Svenn Martinsen for the info.