In a few days, a small portion of additional RIAs will be spawned with a start date of near 7 days, meaning they will not be showing up on your IA lists distributed by your crews. This is designed to reward the hitters that stay active and want to work for their keep, as well as those who do not have easy accessibility to IA lists, nor the vision to build their own.

These will be spawned very infrequently at first to test the waters, and may increase to 10-15 a day if we feel it adds to the experience.

Will these RIAs be visible to everyone or will the have random stealth?

The easiest way to determine this, is to compare an IA lists with RIAs that are not found on the list, then have people of different info look at the locals and feel out their vision. Your HSL should be able to answer this for you after a little bit of testing.