It is sure to effect consumer prices
Consumer effect is secondary and impact to the consumer likely to be zero to beneficial, as most mfrs who wanted to establish control of pricing have limited who they use as retail partners. With this, you might actually be able to get your iMac at Walmart.
Impact on prices? Little to none.
The whole point in this case is to control prices. And you can be sure the manufactures don't want to depress prices.
The long term impact may be beneficial to consumers, that is very hard to judge at this point. The short term impact is sure to be higher prices, particularly for no alternative products. CDs and DVDs are sure to rise a bit, among other products.
Despite that, it may turn out to be good for consumers in the long run. Price control like this will help small specialty stores over the big box chains. This may increase diversity of products and lead to higher quality.
It is still all fairly uncertain though, because it will depend heavily on what happens when this case is kicked back to the lower court. At this point the Supreme Court has only said that not all price floors are illegal. Either this case, or new one, is sure to bring this back to the Supreme Court shortly addressing the question of when price floors are illegal.
My fear is that the court may rule in a way that lets manufactures fix prices. Something that, while leaving it illegal in theory, sets the bar so high for retailers that they can never win price fixing cases.
Jay