Do freeBayes and platypus support gVCF?

https://sites.google.com/site/gvcftools/home/about-gvcf

With GATK you used to have the 1000 + 1 genome variant calling problem, where you had to redo the whole expensive multi-sample variant calling (gatk haplotype caller) if you wanted to add a single genome.

Now GATK Haplotype caller can create intermediate gVCF files for each sample and do a much less expensive merging of the gVCF files to a multi-sample vcf.

https://www.broadinstitute.org/gatk/gatkdocs/org_broadinstitute_gatk_tools_walkers_variantutils_GenotypeGVCFs.php

Do freeBayes and and platypus also support this or are they planning to support this?
My understanding is that freeBayes, platypus and samtools do not yet support gVCF files. However, you can work around this by calling variants from individuals files, merging the variant calls and then recalling the individual bam files at all sites called variant in at least one individual. See [this excellent blog post][1]

 [1]: http://bcbio.wordpress.com/2014/10/07/joint-calling/