Nightwish mastermind Tuomas Holopainen announced the band's studio entrance plans, expressing hope for a full release in the spring of 2015, as well as never going through a lineup change again. "After this promotional trip I'm gonna go into deep hibernation and start working on the next Nightwish album," the keyboardist told Metal Hammer TV. "We have already booked a studio and the rehearsal place for next summer, starting in July. So if all goes as planned, we should have a ready album in our hands by the end of the year , which means a release in the spring time of 2015." Seeing that singer Floor Jansen and multi-instrumentalist Troy Donockley (pipes, whistles and vocals) were confirmed as the group's fully-fledged members last month, Holopainen discussed what he hopes their studio input would be, pointing out that he's aiming at an "old-school" album. "I hope we get to do sort of a band album once again. I think that the last three albums we have done - they are very much on the theatrical side - there's a lot of drama, a lot of orchestra, a lot of dynamics and that's exactly what we wanted to do, I wouldn't change a note in any of those albums," Tuomas explained. "So maybe at this point it might be a welcome idea to go back a little bit, to do an album in the old-school way, just to be a really tight six-piece band again." During the rest of the chat, the keyboardist admitted that lineup changes have clearly bothered him and is now hoping for Nightwish to never go through a personnel shift again. "I wouldn't actually mind to have the same lineup all the time. I really hope we never have to do a lineup change anymore. [laughs] It's quite an energy vampire, these lineup changes, so let's hope that this will last for another fifty years." The band's latest studio effort, "Imaginaerum," saw its release in November 2011 as the seventh record in Nightwish opus, peaking at No. 27 on the US Billboard 200 chart.