Juche, the answer has not changed since you last raised the question. There will be a 10% tax on the net proceeds of the sale. Not a 10% tax on the net profit of the sale. This is not a capital gains tax, but a sales tax.
To avoid the tax you can wait until 1.1.2012, or there is the option to re-invest the funds into another property within 2 years. In this case you only need to re-invest the equity that you have in the property, not the full debt + equity that is in the property now.https://polishforums.com/archives/2005-2009/real-estate/avoiding-tax-selling-flat-38443/
The only answer you can 100% rely on is to petition the tax office in writing (a good accountant can help you with this). You will receive a formal written response from them within a few months