It is dangerous to answer without using the new version, but this game is supposed to be dangerous.
Your old data should be perfectly fine, but if you don't have prices set for a station, you won't get a value shown. Obviously...
If some of the config files are changed, you may discover that values set in the past have been forgotten. Like if I myself defined the government "revolutionary hippies", and use the new default government list, all my revolutionary hippie information will be shown as blank. If you got "expiring stuff" you can probably query replace them in the text files used for storing your data. Making a backup before using a new version is a good habit for any program, anyways. And do at least make a backup before doing query/replace on a file with data you care about.
The most important data should be station names, system names, demands, prices, and notes. I am sure they will survive just fine.