"Przyjeżdżam jutro."

Translation: I am arriving tomorrow.

[Kohvikruus]

So, no way could this be interpreted in the future: "I'll arrive tomorrow"?

[Jellei]

Yeah, it could. Both English and Polish can use a present tense construction to say things about the future like here. So I guess it's going to be accepted now.

[Kohvikruus]

I've seen other such cases too, but even on the basis of a related languages such things are hard to be sure about.