Stage 20 will finish at Guadarrama. That means Asturian stages won't be on a weekend.
My guess is that they'd need a transition stage between Asturias and Guadarrama, so Angliru and Cruz de Linares would be on Wednesday and Thursday respectively and the ITT at Valladolid would be on Tuesday in the second week.
Stage 1: Barcelona TTT
Stage 2: Mataró - Barcelona
Stage 3: ??? - Andorra
Stage 4: Andorra - Tarragona
Stage 5: ??? - Burriana
Stage 6: ???
Stage 7: Utiel - Oliva
Stage 8: ??? - Miserat?
Stage 9: Murcia???
Rest day
Stage 10: Valladolid ITT?
Stage 11: ???- Laguna Negra
Stage 12: transition stage in Aragón
Stage 13: Biescas - Tourmalet
Stage 14: Belagua (Hourcere+Larrau)
Stage 15: Lekunberri (S.Miguel de Aralar)
Rest day
Stage 16: Cantabria???
Stage 17: Ribadesella - Angliru
Stage 18: Pola de Allande - Cruz de Linares
Stage 19: transition stage in Leon-Zamora
Stage 20: ??? - Guadarrama
Stage 21: Madrid
La sierra acogerá la penúltima etapa de la carrera. La jornada, en la antesala de Madrid, servirá como homenaje a la desaparecida Clásica de los Puertos.
as.com