Yes you can still offset mortgage etc against the income from the property.
I far as I ama asware, UK and Foreign property has always been assessed separately!
What the change means is that if you have several properties in the UK - some holiday lets and others long term lets - then EACH CATEGORY will be assessed on its own. So for example if you make a loss on a furnished holiday property and a profit on a unfurnished long term let one, you cannot offset the profit on one against the loss on the other. You will have to pay the tax due on the one in profit but you can carry forward the loss on the other one and offset against any profit you make on it in future years.
There is some more info on the Holiday Lettings website - http://www.holidaylettings.co.uk/pressrelease.asp?article=143&utm_source=newsletter&utm_medium=email&utm_campaign=honews-julyfhl
Clear as mud? Phone the Inland Revenue - they are actually very helpful, and no I've never worked for them just had great service and help over the years on my rental properties.