Yeah this is pretty much confirmed. Polish and Czech Reddit users found the new companies in local business databases. I think the Czech subsidiary was registered mid December and the Polish on January 4. they also have open positions for these 2 countries on Tesla`s career site. (May be a bit hard to find as the location is called "remote", but you can use Ctrl+F on the career page with the country name.There is a report in Polish newspapers that Tesla registered companies in Poland and Czechia and is in final stages of preparation to launch in these two markets. It has a confirmation quote from Even Sandvold from Tesla PR office in Oslo (?).
They will start with service centers but they will also handle sales and online orders will also be enabled.
Source: Tesla zaparkuje w Polsce. Otworzy serwis samochodowy
Does anyone know / remember how long it took from 1st reports (e.g. company registration) to actual openings when Tesla was entering other markets? It's probably no indicator as every market is slightly different, but just curious.
Rumor has it the Polish store will open in February as per the Reddit thread.