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когда-нибудь stresses
gen.	anywhen; sooner or later; eventually (в будущем Stas-Soleil); on the day; some day or other; some summer's day; some fine day; some place; one day; one of these fine days (о будущем); one of these days (One of these days, he won't be so lucky. 4uzhoj); ever; sometime; some time or other; some time; yet; in the fullness of time (VLZ_58); by and by (Andrey Truhachev); at some stage (suburbian); at some point (в знач. "рано или поздно, в какой-то момент" 4uzhoj); some day (в будущем); down the road (VLZ_58); someday; at one time or other; at any time; in interr. sentences ever; other time
idiom.	somewhere down the road (Somewhere down the road, they're going to clash. VLZ_58)
inf.	for ever and a day
lit.	elsewhen (ещё Artjaazz); elsewhen (ещё; At some other time or times. – answers.com Artjaazz)
media.	at some time (igisheva)
polit.	Alki (Washington state motto Chinook Jargon: By and by / Some day Andrey Truhachev); Al-ki (Washington state motto Chinook Jargon: By and by / Some day Andrey Truhachev)
rhetor.	at some point (Alex_Odeychuk)
uncom.	somewhen; once
uncom., dial.	otherwhiles; otherwhile

когда-нибудь: 143 phrases in 9 subjects

American usage, not spelling	3
Figurative	1
General	75
Idiomatic	3
Informal	4
Literature	2
Makarov	53
Music	1
Uncommon / rare	1