It did not mention what kind of Solaris? Is that Solaris Sparc 64bit or Solaris x86?
Just to set expectations, Its not going to be very simple as its cross platform migration. But hundreds of customers are migrating now to Linux. Both 12.1 and 12.2 have different documents for this. Check below.
Application Tier Platform Migration with Oracle E-Business Suite Release 12 (Doc ID 438086.1)
Application Tier Platform Migration with Oracle E-Business Suite Release 12.2 (Doc ID 2048954.1)
Have you known anybody who had tried it yet successfully? and shared the procedure in their blogs?