Year 2010 was quite a flowerless year for me. However, C. sp. 'Pahang 2' finally flowered this month (i.e. Jan 2011) after more than 1.5 years in cultivation. I believed this could be what some other people termed as "C. nurii with cordate leaves" on the Internet. Below are the photographs of the spathe and interior of the kettle for your reference.
And finally another close up shot of the yellowish flab (valve). After your review of the above, is this C. nurii?