역시나 · 역시 (more neutral)
as expected, sure enough
Example
역시나 오늘도 지하철이 사람으로 꽉 찼어요.
As expected, the subway was packed with people again today.
Word parts
역 also+시 this, is
역시 'also, as expected' + emphatic -나; stresses that it happened just as predicted.