Learn Swedish: Hon ska lansera den nya versionen om ett år. - She will launch the new version in a year.

Yes, om often means "about" in Swedish. But when you are talking about an event happening at the end of a specific time period in the future, om translates to "in". So, om ett år means "in one year" or "one year from now".

Could I use kommer att lansera instead of ska lansera to say she "will launch" it?

Yes, you could! Both talk about the future. However, ska strongly implies intention or a deliberate plan (she plans to launch it). Kommer att is more of a neutral prediction. Since a product launch is a planned event, ska sounds very natural here.

Why do we need both den and the -en ending in den nya versionen?

This is a classic Swedish grammar rule called "double definiteness." When you put an adjective before a definite noun (like "the new version"), you must use the separate definite article (den) and keep the definite ending attached to the noun itself (versionen).

Why is the adjective spelled nya instead of just ny?