There is a separate Adobe Reader for iOS forum which is where you should submit your request. Currently links always show blue in Adobe Reader.
If you use another reader like PDF Expert ($US 9.99 from Readdle, an excellent reader!) they will not.
Thanks for your feedback. Apparently I'll have to live with it for now then...
The new release of Acrobat Reader (January 2014) solves the question: all links invisable now! Yeay!!
You're correct. My mistake. I just hadn't opened up a file with hyperlinks since the update and didn't notice. Not mentioned in the release notes.