IBL lighting has been around since Poser 6. I use IBL lighting in Poser 7 very extensively and there are some very good IBL light sets by SaintFox, Blackhearted and others. 

For female characters in Poser, you will find far more character products for V4 than all the others combined, and that is largely on account of the V4 morphs++ package.  And because V4 is so widely used, there are vastly more clothing and hair products for her. Yes, these can be converted to other figures with Wardrobe Wizard but these conversions rarely fit as well as on the original.