The indicative is generally used in parenthetical or appended relative clauses with ὅστις (ὅστις ποτέ). Thus,
δουλεύομεν θεοῖς, ὅ τι ποτ' εἰσὶν οἱ θεοί
a. The subjunctive with ἄν is also used when the reference is to future time or to general present time. Cp.
Herbert Weir Smyth [n.d.], A Greek Grammar for Colleges; Machine readable text [info] [word count] [Smyth].