Floor Jansen of ReVamp (ex-After Forever) has been drafted in to help Nightwish complete their Imaginaerum tour after their mutual split with Anette Olzon (see the press statement here). Floor has explained in recent interviews that she had already been recruited to sing with the band for the shows in November/December - for reasons unknown to the public - and had been practising for about a week before receiving a message asking if she could join them on the US tour immediately after Anette was taken ill.
Floor has been a Nightwish fan for many years and previously toured with the band when After Forever supported them. She has described it as "an honour" to sing with them but that as yet there as been no discussion of her singing on future studio albums. ReVamp will continue working on their second album, due next year.
Members of Nightwish and After Forever together
Videos of Floor singing with Nightwish
(Shot by YouTube user TuaMater)
Dark Chest of Wonders
Slow, Love Slow