Theoretically we should be around 11.3% inflation of the number of bitcoin in existence (B0) as today.
If we suppose a 25% faster rate of mining, the real inflation of B0 is around 14%/year.
My assumption is a lot of bitcoins are locked in some long term cold storage never touched by anyone, so the real B0 used for daily transactions (the part affecting now the exchange rates with fiat) is a lot lower.
If we suppose all bitcoin mined are sold in the market for cash (to recoup investments and pay for expenses) this would cause a lot larger real inflation of the number of bitcoin available on the market and push the price lower a lot lower.
The alternatives are two:
1) not all bitcoin mined are sold in the market for fiat, just a minimum needed to pay living expenses. Every profit is left in BTC form.
2) a lot of fiat is, anyway, entering the BTC ecosystem and being converted in BTC (directly via exchanges or indirectly via direct selling of good and service) and these BTC are saved for a later time and not used to buy stuff or services or re-exchanged for fiat, reducing the number of BTC offered on the market.
Faster than designed mining and increasing price of BTC are a good sign. If we get halving ahead of schedule, the inflation will become half overnight ahead of schedule, reducing a lot the offer of newly minted BTC.
BTC would go ahead of schedule from 9.1% of inflation to 4.55% of inflation per year. The price would skyrocket.
For comparison, the monetary base of € went from 400 to 1.200 billions from 2002 to 2012 (11.2% inflation per year), this in a period where inflation were considered low.
Just now, the inflation in Bitcoin is at par with the inflation in the € (and a bit lower than the US$). The price is driven just by adoption as a payment system and saving.
But as we approach the next halving the reasons to move from fiat to BTC to save become stronger.
Given the current situation, at the next halving, we can expect an advantage of 4.5% on the rate of inflation for Bitcoin against the €.
And there are a lot more advantages to hold bitcoin instead of fiat in the bank or outside the bank (like not be dependant on the bank solvency and liquidity, the central bank restraining, the government limitation).
Bitcoin adoption is far more higher than inflation. When price of Bitcoin goes from $13 to $130 (1,000%) driven by adoption then it does not matter if inflation is 4,55% or 11,3% because 1,000% - 11,3% is almost same as 1,000% - 4,55%.
Edit: even Gox fees are few times higher than inflation (Edit2: this is not true :-) )