Mos, the town of Oscar Pereiro, will host the start of the 18th stage. According to the local newspaper, it will be one of three stages in Galicia. Given that Mos is located in the southwest corner of Galicia, I guess it will be the final Galician stage (to Luintra), with a flat stage 19 and stage 20 in the mountains in Salamanca province. The real question is what the third Galician stage will be, perhaps Ancares is in the route after all, if there actually is a third Galician stage (doesn't fit extremely well).
The second week will have a flat stage from either Miranda de Ebro or Castrillo del Val to Aguilar de Campoo. The stage should be between the Valdegovia and Suances stages. With stages 16 to 18 seemingly in Galicia, it will probably be either stage 11 or 12.
The route should be something like the one below. It's possible that Laguna Negra is stage 6, Moncalvillo is stage 10 (in which case, move the following stages one ahead) and either La Camperona or the first Galician stage is out.
Week 1
Stage 4 Irun - Arrate (MTF with Karakate and Arrate)
Stage 5 Pamplona - Lekunberri (mountain with San Miguel de Aralar)
Stage 6 Logroño - Moncalvillo OR Laguna Negra de Urbion (MTF)
Stage 7 Soria - Ejea de los Caballeros (flat)
Stage 8 Huesca - somewhere in the Pyrenees around Jaca or Sabiñanigo (easy mountain stage, possibly MTF)
Stage 9 Jaca, Sabiñanigo OR Biescas - Tourmalet (MTF with at least either Somport or Portalet, then Aubisque and Tourmalet)
Rest day
Stage 10 Vitoria-Gasteiz - Valdegovia (mid-mountain with Orduña)
Stage 11 Miranda de Ebro OR Castrillo del Val - Aguilar de Campoo (flat)
Stage 12 Castro Urdiales - Suances (flat or mid-mountain)
Stage 13 Somewhere in Cantabria - La Camperona (MTF)
Stage 14 Cistierna? - Angliru (MTF, should have at least two cat. 1's before Angliru)
Stage 15 ? - La Farrapona (MTF, probably through San Lorenzo)
Rest day
Stage 16 (could also be before the restday): Somewhere in Galicia, either Ancares or something (much) easier.
Stage 17 Muros - Mirador de Ézaro (ITT with HTF)
Stage 18 Mos - Luintra-Ribeira Sacra (mid-mountain, should be the same finale as 2016 and 2018)
Stage 19 Somewhere in Zamora - Ciudad Rodrigo or somewhere else in Salamanca (flat)
Stage 20 Ciudad Rodrigo or somewhere else in Salamanca - La Covatilla or somewhere nearby-ish (mountain)
Stage 21 Madrid parade (flat)
The second week will have a flat stage from either Miranda de Ebro or Castrillo del Val to Aguilar de Campoo. The stage should be between the Valdegovia and Suances stages. With stages 16 to 18 seemingly in Galicia, it will probably be either stage 11 or 12.
The route should be something like the one below. It's possible that Laguna Negra is stage 6, Moncalvillo is stage 10 (in which case, move the following stages one ahead) and either La Camperona or the first Galician stage is out.
Week 1
Stage 4 Irun - Arrate (MTF with Karakate and Arrate)
Stage 5 Pamplona - Lekunberri (mountain with San Miguel de Aralar)
Stage 6 Logroño - Moncalvillo OR Laguna Negra de Urbion (MTF)
Stage 7 Soria - Ejea de los Caballeros (flat)
Stage 8 Huesca - somewhere in the Pyrenees around Jaca or Sabiñanigo (easy mountain stage, possibly MTF)
Stage 9 Jaca, Sabiñanigo OR Biescas - Tourmalet (MTF with at least either Somport or Portalet, then Aubisque and Tourmalet)
Rest day
Stage 10 Vitoria-Gasteiz - Valdegovia (mid-mountain with Orduña)
Stage 11 Miranda de Ebro OR Castrillo del Val - Aguilar de Campoo (flat)
Stage 12 Castro Urdiales - Suances (flat or mid-mountain)
Stage 13 Somewhere in Cantabria - La Camperona (MTF)
Stage 14 Cistierna? - Angliru (MTF, should have at least two cat. 1's before Angliru)
Stage 15 ? - La Farrapona (MTF, probably through San Lorenzo)
Rest day
Stage 16 (could also be before the restday): Somewhere in Galicia, either Ancares or something (much) easier.
Stage 17 Muros - Mirador de Ézaro (ITT with HTF)
Stage 18 Mos - Luintra-Ribeira Sacra (mid-mountain, should be the same finale as 2016 and 2018)
Stage 19 Somewhere in Zamora - Ciudad Rodrigo or somewhere else in Salamanca (flat)
Stage 20 Ciudad Rodrigo or somewhere else in Salamanca - La Covatilla or somewhere nearby-ish (mountain)
Stage 21 Madrid parade (flat)
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