The rumour of Andorra is confirmed according to Ciclo21
http://www.ciclo21.com/vuelta-espana-2018/
There will be a finish coming from the province of Huesca with two climbs in Spain and La Comella with a finish in town. The second stage will be 'spectacular'. A copy of (or a variation on) the 2015 stage is in the making.
So the rumour of Javalambre was Unipublic trolling us.
Olders posts in Ciclo 21 include the departures and finishes of some stages in the first week. These allow completing a route with only two gaps.
Stage 1: Malaga ITT
Stage 2: Marbella - Caminito del Rey (MTF)
Stage 3: Mijas - Alhaurín de la Torre
Stage 4: Velez Málaga - La Alfaguara (MTF)
Stage 5: Granada - Province of Almería???
Stage 6: Huercal Overa - Province of Murcia???
Stage 7: Puerto Lumbreras - Pozo Alcón
Stage 8: Linares - Castilla la Mancha???
Stage 9: ??? - La Covatilla (MTF)
Rest day (Monday)
Stage 10: Salamanca - Fermoselle?
Stage 11: Province of Zamora??? - Luintra
Stage 12: ??? - Estaca de Bares
Stage 13: Candás - La Camperona (MTF)
Stage 14: Cistierna - Lagos de Covadonga (MTF)
Stage 15: ??? - Les Praeres? (MTF)
Rest day (Monday)
Stage 16: ???
Stage 17: Getxo - Monte Oiz (MTF)
Stage 18: ???
Stage 19: Province of Huesca? - Andorra
Stage 20: Andorra 'spectacular' mountain stage (MTF?)
Stage 21: Madrid
I have tentatively placed the Monte Oiz stage on Wednesday to avoid the 4 MTFs in a row. There are two gaps, one of them I would expect is an ITT. I have counted 8 MTFs but rumours said that Guillén said there would be 10. So maybe there are a couple of small muritos there I'm missing or one of the unknown stages in the last week is another MTF.
Waiting to see the detailed stage routes this can be anything from garbage to decent.