They do:
Trend Micro Safe Browsing App for iPhone
And HERE is why Trend Micro released the article:
Trend Micro Releasing Android App at CES called Mobile Security.
Hmmm, can you say "ulterior motive?"
Good to know about these new products. You did note that they are both free. That tends to confirm that their sales are more based on enterprise management, not individual devices, and that they have nhothing to gain by favoring one over the other.