Una Due Ttc, I don't know what the total Boeing investment was in the 747-8/8F (and if I did I probably couldn't repeat it) - I do know it went well over budget. But I'm sure it was a small fraction of the A380 development costs. I do know that the original business case for the -8 was based on a relatively small production run, but the development cost overruns certainly increased that number significantly.
As for the A380 "moving into the black" this year, what Airbus has said is that they expect the A380 to become 'cash flow positive' in 2015 - meaning they are spending less to build each aircraft than they are selling them for. They remain far from paying off the reported $15 - $20 billion development costs.
Both Boeing and Airbus have some tough decisions coming up quickly - the long lead time for some of the 747 and A380 parts is over 30 months and both programs have significant holes in their delivery projections starting in 2018.