"Numerous rumors" means there are many different pieces of information or claims being spread around, but their accuracy is uncertain or unconfirmed. Full definition
This is probably borne out of the fact that they have heard numerous rumors about Russian brides and mail order brides. (blog.behappy2day.com)
The device is constantly being followed by numerous rumors and leaks. (mobilenapps.com)
There's been numerous rumors as well as the overall specs, but as far as actually seeing the device, that was a whole other story. (androidheadlines.com)