This is the word coming from the lads at GSM Helpdesk.nl, who also claim that both the 16GB and 32GB versions of the pale smartphone will be available in Holland when it's eventually released. This speculation is boosted by the facts it's now available on the site of the Dutch T-Mo (we can't verify since when it has been placed on the carrier's page), and that 2call.nl is also offering the (soon to be not so) mythical phone for pre-order.
There's a mounting pile of evidence that suggests we are soon to see a wide-scale launch of the white iPhone 4 around the globe. It's speculated that this handset will be available for both Verizon and AT&T in the US.
source: GSM Helpdesk.nl (translated), T-Mobile Netherlands (translated) and 2call.nl (translated)